Start of hotfix development
Bugfix: Database error Duplicate entry.

Sometimes this error occurs when MySQL hasn't written to the database yet and the spammer is back on the site already. It causes the logfile to be flooded with this error message.
Adds German translation
Fix some text
Update the changelog
Version bump 3.6.1
Merge branch 'hotfix/3.6.1'
Merge tag '3.6.1' into develop

Tag 3.6.1
Version bump 3.6.1
Version bump 3.7.0-dev.4